bugaboo bee. what lie flat car seats are compatible? if any?

hi, im asking on behalf of my friend. she needs a buggy that that is foldable in one piece and car seat compatible, and suitable from newborn, (as in the main seat stays in the frame at the same time) as she needs to fly and travel regularly. after much looking it seems the bugaboo bee will work best.

originally she was looking at a regular maxi cosi car seat or the bugaboo car seat, but is now hoping that a lie flat/reclining one will fit as baby may need to spend longer periods of time in the car than recommended.

has anyone tried the maxi cosy prezi? if so does it only half recline as appears in the images. or will the others such as concord/jane/britax/ stokke lie flat ones fit.

it defiantly needs to fit on top on the bee frame as she will have times when she will need to transport baby/car seat/pram/ and pull a suitcase alone. ideally the car seat will also be allowed/ compatible on the plane but this isnt important if not